Tool-holding device.



UNITED STATES PATENT OFFICE.

JOI-IN BECKER, OF HYDE PARK, MASSACHUSETTS.

TOOL-HOLDING DEVICE.

To all @1J/omit may concern.'

Be it known that I, JOHN BECKER, a citi- Zen of the United States, and aresident of Hyde Park, in the county of Norfolk and State ofMassachusetts, have invented an Improvement in Tool-Holding Devices, ofwhich the follo-wing description, in connection with the accompanyingdrawings, is a specification, like letters on the drawings representing`like parts.

This invention relates to tool holding devices and more particularly toa construction whereby a tool may be readilyy drawn into and secured inthe usual spindle and readily removed therefrom.

The character of the invention may be best understood by reference tothe following description of an illustrative embodiment thereof shownyin the accompanying drawings, wherein:

Figure 1 is a vertical section of a tool holding device embodying myinvention; Fig. 2 is a view similar to Fig. 1 showing the partsdifferently positioned; and Fig. 3 is a horizontal section taken on theirregular line 3 3 of Fig. 1.

Referring to the drawings, 7 typifies Va tool receiving device herein inthe form of a usual spindle such as is used in milling, drilling andother machines, said spindle being provided with the usual tapered bore9 for receiving the tapered shank 11 of a milling cutter or other tool13. Heretofore a variety of devices have been used for securing the toolin the spindle,'and among others a draw-bar hasbeen used, which isintroduced into the spindle through the upper end thereof and isprovided with a threaded end adapted to be screwed into a threaded borein the end of the tool shank to draw said shank tightly into thespindle. This, however, has been found to be a disadvantageousconstruction since the threaded portion of said bar is necessarily ofsmall diameter causing its threads to become worn and ineffective, andby said bar the toolk cannot be readily removed from the spindle, itbeing usually necessary to remove said bar from said spindle and drivesaid shank therefrom. Furthermore, said bar is undesirable since in tallmachines the top of the spindle is out of convenient reach of theoperative. I aim to overcome the objections to the draw-bar and otherconstructions by my invention which I will now describe.

Specification of Letters Patent.

Application filed December 7, 1909, Serial No. 531,780. Renewed October5, 1911.

Patented May 27,1913.

Serial No. 653,059.

This device comprises opposed crescent or segmental shaped jaws 15 whichmay be curved at their inner edges 17 to 4form an opening through whichthe tool 13 referred to maybe introduced. Thesejaws are adapted to-bemoved into a recess or peripheral groove 19 in said tool, such, forexample, as the usual groove occurring between the cutting portions andshank of the tool and are carried by a flange 21 of a ring 23 the latterbeing threaded on a draw nit or collar 25, threaded, in turn, on thenose of the spindle referred to. After the tool shank has beenintroduced between said jaws and initially positioned loosely in thetaper bore of said spindle (Fig. 2) said jaws are caused to approach andare locked into the tool groove 19. To this end the ring supportingflange 21, referred to, is provided at its upper face with a beveled orcam edge 27 adapted t-o engage correspondingly beveled or camperipheries 29 on the under sides of said jaws. It will be apparent thatas said jaw supporting ring 23 is screwed onto said ring carrying nut 25the jaws 15 will be raised and by the action of their beveledperipheries upon the bevel surface of the supporting and lifting ringflange 2l said jaws also will be carried toward one another and enterthe peripheral groove 19 in said tool and be securely locked or clampedbetween said supporting ring 23 and said ring carrying nut 25. Toprevent interference with the natural centering of the tapered shank ofsaid tool into the taper bore of said spindle, said jaws -preferablyshould not pinoli the tool between them, but should merely enter thegroove 19 without engaging the bottom of the latter. To limit the innermovement of said jaws and contribute to the positioning of the same, thenut 25 is provided with an annular guiding groove 31 adapted loosely toreceive flanges 33 (Fig. 2) projecting upwardly from the peripheries ofsaidjaws. As the jaws are carried toward one another, as by screwing thejaw supporting ring onto the ring carrying nut, said jaw flanges willbear against and be limited by the inner wall 35 of said groove 31thereby preventing the edges of said jaws from engaging the bottom ofthe groove 19 (see Fig. 1) in said tool. The jaws having been lockedinto said tool groove as described the nut 25 is then screwed onto saidspindle, thereby bodily moving said jaws up into engagement with theupper side of the groove 19 (F ig. l), the

continued movement of said jaws drawing the tapered shank of said tool,which was initially positioned as shown in Fig. 2, up into the taperbore of said spindle as shown in Fig. 1, as tightly as desired. As thenut 25 is turned or screwed onto the spindle, the jaws 15 carriedtherewith will be free to slide around in the peripheral groove 19 insaid tool without imparting a turning movement to said tool. As a resultthe tool shank may be thrust axially in a straight line into the bore ofsaid spindle without turning and without injury to the surfaces of saidshank and bore. spindle it is merely necessary to turn said nut in theopposite direction thereby carryingsaid jaw supporting ring and its jaws15 toward the end of said spindle and into engagement with the lowerside of the tool groove 19, the continued movement of said nut drawingthe shank out of the taper bore in said spindle. The ring23 may be thenunscrewed from said nut to release said aws and permit the latter todrop again into the position shown in Fig. 2 thereby permitting the toolto be withdrawn therefrom. To facilitate the entrance and removal o-fsaid tool between said jaws the latter may be rounded at their inneredges as desired. Said nut and ring may be turned in any suitablemanner. Herein their peripheries are provided with spaced holes 37adapted to receive a suitable spanner wrench.

My invention provides a device by which the tool may be positivelyforced into the taper bore without in any way interfering with theaccurate centering of the taper tool shank in the taper bore of thespindle. The large threads which unite the ring carrying nut to the noseof the spindle present a connection of great strength and durability,permitting said tool shank to be forced into said spindle bore astightly as desired.4 The tool even though forced with extreme tightnessinto said spindle may be readily and quickly removed by simplyunscrewing the ring carrying nut toward the end of the spindle whereuponthe tool may be released from the jaws clamped between said nut and ringby unsere-wing the latter fro-m said nut. It will be apparent that by mydevice no wedge keys, bars or other objectionable devices to be poundedor driven, with accompanying rack and injury to the parts, are necessaryto remove the tool shank out of the taper bore o-f the spindle as havehitherto been necessary. Furthermore, the device is always convenientlyaccessible for inserting and removing tools as desired.

Having described one embodiment of my invention without limiting myselfthereto, what I claim as new and desire to secure by Letters Patent is:

1. A device of the class described comprising, in combination, toolreceiving means To remove the tool from the4 having a bore the-rein, atool having a shank adapted to be introduced into said bore, a shoulderon said tool extending transversely to the axis thereof a nut on saidtool receiving means, a ring threaded on said nutand tool engaging meansadapted to be moved into engagement with said tool shoulder by relativemovement of said nut and ring. j

Q. A device of the class described comprising, in combination, toolreceiving means; a tool having a portion adapted to be introducedtherein; and means for setting said tool in said tool receiving means,comprising tool engaging means and two-part means relatively adjustableto move said tool engaging means into engagement with the tool andadjustable as a whole relatively to said tool receiving means forsetting the tool therein.

3. A device o-f the class described comprising, in combination, toolreceiving means, a tool having a shank adapted to be introduced intosaid means, tool engaging means, positioningmeans to move the latterinto a position positively to engage said tool and means to move saidpositioning means axially of said tool receiving means to force saidtool shank therein.

4. A device of the class described comprising, in combination, toolreceiving means; a tool having a. shank adapted to be introduced intosaid means; jaws; cam means for forcing said jaws toward said tool; andmeans to move said cam means axially of said tool receiving means toforce said shank therein.

5. A device of the class described comprising, in combination, toolreceiving means having a tapered bore therein; a tool having a taperedshank for insertion into said bore; jaws; means to adjust .said jawsinto a recess in said tool; and means to adjust said jaws, means andtool bodily to thrust the tool. shank into said tool receiving means,said jaws having portions guided by said thrusting means. 1

6. A device of the class described comprising, in combination, toolreceiving means, a tool having a shank adapted to be introduced intosaid means, a collar threaded onto said tool receiving means, jawsguided by said collar and a cam ring threaded onto said collar formoving said jaws into a recess in said tool.

7. A device of the class described comprising, in combination, toolreceiving means, a tool having a shank adapted to be introduced intosaid means, a nut on said tool receiving means, a groove in said nut,jaws having portions loosely occupying said groove and means to forcesaid portions against a wall of said groove to limit the movement ofsaid jaws and cause the latter to enter a recess in said tool.

8. A device of the class described comprising, in combination, toolreceiving means having a tapered bore therein, a tool havin@ a taperedshank adapted to be introduced into said means, a collar threaded ontosaid tool rec-eiving means, jaws guided in a groove in said collar, anda ring threaded to said collar and having a beveled edge for engagingsaid jaws to move the latter into a peripheral groove in said tool.

9. A device of the class described comprising, in combination, a toolreceiving means having a tapered bore therein, a tool having a taperedshank adapted to be introduced into said means, a collar threaded onsaid tool receiving means, a ring threaded on said collar and opposedjaws received by said ring, said jaws and ring having cooperating camsurfaces whereby said jaws are moved into a position to engage said toolby relative movement between said collar and ring.

10. A device of the class 'described comprising, in combination, toolreceiving means having a tapered bore therein, a tool having a taperedshank adapted to be introduced into said means, a collar 25 threaded onsaid tool receiving means, a ring 23 threaded on said collar and toolengaging jaws 15 coperating with said ring.

11. A device ot' the class described comprising, in combination, toolreceiving means; a too-l having a taper shankfor insertionv in saidmeans; tool engaging means for entrance into ay circumferential groovein said tool; means to adjust said tool engaging means into said groove;

'means to thrust said adjusting means longitudinally of said toolreceiving means; and means to limit the entrance of said tool engagingmeans into said groove whereby to prevent said tool engaging means fromgripping said tool and imparting rotative movement thereto as said toolis tightened in said tool receiving means.

l2. A device of the class described comprising, in combination, toolreceiving means having a bore therein; a tool having a portion formed orinsertion into said bore; tool-engaging means, and rotative means foradjusting said tool-engaging means toward said tool and axially of saidtool receiving means, said rotative means and tool-engaging means beingformed to limit the movement of said tool-engaging means toward saidtool to provide a loose engagement of said tool-engaging means with saidtool, permitting thelatter to be thrust axially but not rotatively.

18. A device of the lclass described comprising, in combination, toolreceiving means having a bore therein; a tool having a portion formedfor insertion into said bore; tool engaging means; actuating means tomove the latter into engagement with said tool; and operating means forsaid actuating means to move the latter toward or from said toolreceiving means, said tool engaging means and operating means havingprovision for prevent-ing said tool engaging means from gripping saidtool to permit the seltcentering of the latter in said tool receivingmeans. i

A device of the class described comprising, in combination, toolreceiving means; a tool having a portion for insertion therein; toolengaging means adapted to open to permit the introduction of said toolinto said tool receiving means; actuating means to close said toolengaging means; and means to move said actuating means to draw the endof said tool into said tool receiving means.

15. A device of the class described comprising, in combination, toolreceiving means; a tool formed for insertion therein; separable jaws; aring for closing the latter into positions to engage said tool; and acollar coperating with said tool receiving means for moving said ring,jaws and tool to set the latter into said tool receiving means.

16. A device of the class described comprising, in combination, toolreceiving means; a tool formed for insertion therein; tool engagingmeans; actuating means to move the latter into engagement with saidtool; and means to move said actuating means toward or from said toolreceiving means to insert said tool into or remove said tool from saidtool receiving means.

17. A device of the class described comprising, in combination, toolreceiving means; a tool formed for insertion therein; tool engagingmeans curved to entera peripheral groove in the tool; means to adjustsaid tool engaging means into said groove; and means to adjust said toolengaging means axially of said tool receiving means in oppositedirections to introduce said tool into said tool receiving means orremove said tool from said tool receiving means.

18. A device of the class described comprising, in combination, toolreceiving means; tool engaging means external thereof and adjustablewhile on said tool receiving means into positive engagement with thetool; and means for moving said tool engaging means while positivelyengaging the tool to introduce the latter to or free the same from saidtool-receiving means.

19. A device of the class described comprising,' in combination, toolreceiving means; actuating means; and engaging means adjustablerelatively to said actuating means into and out of positive engagementwith a tool, said actuating means having provision for adjusting saidengaging means to secure the tool to or tree the same from said toolreceiving means.

20. A device of the class described comprising, in combination, toolreceiving means having a taper bore therein; actuating means; andengaging means adjustable relatively to said actuating means into andout of engagement with a tool, said actuating means having provision formoving said engaging means in opposite directions to force the tool intoor release the same from said bore.

21. A device of the class described comprising, in combination, toolreceiving means; actuating means; engaging means adjustable relativelyto said actuating means into and out of positive engagement With a tool;and means to lock said engaging means to said actuating means, thelatter being adjustable to move said engaging means and the tool engagedthereby to secure the latter to or free the same from said toolreceiving means.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing Witnesses.

JOHN BECKER.

Witnesses HENRY T. WILLIAMS, EVERETT S. EMERY.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents. Washington, D. C.

